Improved lathe-chuck



stent @Wire JOI-IN RICH, OF PAINESV'ILLE, OHIO.

Letters Patent No. 94,235), dated August 3] T869.

IMPROVED LATES-CHUCK.

The Schedule referred to in' these Letters Patent and making part of the same.

'the accompanying drawings, and letters-of reference marked thereon, in which- Figure I `is a view of the chuck, complete in all its parts, in which- A is a tube or collar.

B, head, with Vpair of vise-jawsl D secured on the head, and pivot E' on end of shaft E, as shown in Fig. u Y

C, screw, with its head count-ersunk at F, as shown in Fig. II.

Figure II is a longitudinal section.

A, tube.

B, head.

C, screw.

D, vise-jaws.

E', shaft.

E,'pivot point. v

F, coimtersink in screw C.

Figure III. 1) vise-jaws closed.

Figure IV, riew of vise-jaws opened.

Figures V, VI, VII, sectional views of chuck, showing-the collar' A, head B, -vise-jaws D, shaft E', pivot E, screw C, F, head of screw C, countersunk.

The letters of reference indicate similar parts inall the gures. y

The improvements hereinreferred to consist in the employment of a tube or collar A, secured to the end of the screw C, the screw C beingfseculed to the lathe. The shaft E is covered with cement,- and passed into the collar A, the pivot point E being pressed into the countersink in screw C.

The following is a descliption of the construction and operation of my improvement:

It consists in a chuck composed of a tube or collar, attached by being driven tight-lyon the screw-plug C, which-is screwed into the lathe mandrel.

The shaft l is loosely titt-cd to t-he tube or collar, and coated with shellae-cemeut, then pressed into the collar, and heated by a lamp placed` under the tube.

Ihe article on which the pivot is to be turned is placed in thefvise-jaws D, and secured bythe screws in the jaws. The lathe is revolved during the heating of the tube. Then, by placing a piece of pegwood on the lathe-rest, and pressing lightly against the article to be centred, the centre will be formed by the self-adjustment of the shaft in the soft cement in the tube.

In all the chucks of the present make, it is difiicult. to secure a true centre. diameters inthe chucks now in use, the centres are changed by taking them out and placing them back, making it ditticnlt to centre them twice alike.

A In Ymy improvement,` if the centre should be destroyed by removing the article, the tube can be reheated and the centre found by the operation of using the peg-wood. K

This imprm-'ement is to obvi'ate the necessity of waxy ing in the piece to be turned, which was the only true 2. The combination of the tube vor collar A, shaft E', screw-plug C, head B, and vise-jaws D, the whole combined as described.

JOHN RICH.

l\Vitnesses FRANK RUST, '1). W. OAKLEY.

In placing shafts of different 

